      :output-to "samples/hello/out/hello.js"
      :source-map true})
 
-  ;; line 2 column 1
-  (mapped-line-and-column
-    (read-source-map "samples/hello/out/hello/core.js") 2 1)
-
-  ;; hello.core
-  (:ns (ns-info "samples/hello/out/hello/core.js"))
-
   (mapped-stacktrace
     [{:file "hello/core.js"
       :function "first"

      :line <integer>
      :column <integer>}*]

   :file must be a URL path (without protocol) relative to :output-dir."
  ([stacktrace] (mapped-stacktrace stacktrace nil))
  ([stacktrace opts]
    (let [read-source-map' (memoize read-source-map)

      :line 2
      :column 1}]
    {:output-dir "samples/hello/out"})

  ;; URL example

  (cljsc/build "samples/hello/src"
    {:optimizations :none
     :output-dir "out"
     :output-to "out/hello.js"
     :source-map true})

  (mapped-stacktrace
    [{:file "cljs/core.js"
      :function "first"
      :line 2
      :column 1}]
    {:output-dir "out"})

  (print-mapped-stacktrace
    [{:file "cljs/core.js"
      :function "first"
      :line 2
      :column 1}]
    {:output-dir "out"})
  )

(defn- display-error
